PlasmaC Fiber laser 1Kw head height control + auto focuas

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17 May 2020 18:52 - 17 May 2020 18:57 #168083 by taloot
becouse i do some test,,i link esp32 to potetiometer, and i was control the frequency and see how linuxcnc act,,, i start from 10 hz to 20k

at low freq it take time to change position,, at higher than 1k,, its fast. but more,,, i may cant judge it with my eyes
for servo i try 500hz and 1khz and 2khz,,
500hz give more accurate number that 1k and 2k is producing more error but it update faster

0.006% error for 500hz
0.012% for 1k
0.024% for 2k
in pwm freq counting
Last edit: 17 May 2020 18:57 by taloot.

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17 May 2020 19:01 - 17 May 2020 19:11 #168085 by PCW
Are you reading the encoder velocity or position? the position will only be updated at count edges. the velocity estimate will be updated every servo thread period. If your frequency signal has period errors they will influence the accuracy of velocity estimation. In this case
a higher frequency will help.
Last edit: 17 May 2020 19:11 by PCW.
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17 May 2020 21:40 #168090 by taloot
velocity i was testing

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17 May 2020 21:56 #168091 by PCW

0.006% error for 500hz
0.012% for 1k
0.024% for 2k


You are not going to get much better than 10 bit accuracy at 1 KHz servo thread
with unfiltered data because of the timestamp resolution. This can be improved by
setting the timestamp frequency higher

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20 May 2020 06:53 #168345 by thefabricator03
Any updates on your progress?

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20 May 2020 17:18 #168393 by taloot
yes about to finish it,
i make an opensource THC thats support plasma and support laser (capacitance)
and webserver (hosted in esp32 hardware )
using webserver u can set the THC mode 1-laser 2 plasma
also capacitance calibration upper and lower limit ( because value vary depends on head specs size and sheet thickness )
higher and lower frequency for PWM ...

i use ESP32,becouse its faster and more stable PWM, also the hardware is very capable WLAN and BLE.

now it should work well.. but i need to modify Linuxcnc,, to remove the retraction after probing coz it will probe to piercing height directly
in 2-3 days it will be online in my github

i bought this head its new desing


also i found cheap and good laser sources


4 weeks old laser source from JPT its lighter than other sources, cost about 6k$
The following user(s) said Thank You: tommylight, Clive S, thefabricator03

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20 May 2020 21:33 #168410 by taloot

this is the GUI for the THC it works now with analogue to freq (same as THCAD)
i need to add linuxcnc equations for scale and another things,, so it will be easier to set the values. in linuxcnc
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22 May 2020 09:15 #168561 by copyleft
My experience with CO2 laser tube from china is bad, i brought 3 time 100W tube, quality control is very low, after few moths of use they had leakage. Now i buy in Japan, expensive but no problem at the end become cheap.
Be careful dude, the cheap maybe give to you headache

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22 May 2020 09:18 #168562 by thefabricator03

My experience with CO2 laser tube from china is bad, i brought 3 time 100W tube, quality control is very low, after few moths of use they had leakage. Now i buy in Japan, expensive but no problem at the end become cheap.
Be careful dude, the cheap maybe give to you headache


I agree with the CO2 laser tubes. I have seen the China tubes first hand. But Taloot machine is a Fiber laser. Different kind of beast. But like most things I am sure China can make decent anything, you just need to be prepared to pay for it.

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22 May 2020 09:49 #168566 by rodw

I am sure China can make decent anything, you just need to be prepared to pay for it.


They certainly can! Attending a trade show in Shanghai was an eyeopener for me.

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